Motion sensor



FIG. 1 is a perspective view of the motion sensor, with the broken line showing for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a front plan view of the invention.

FIG. 3 is a rear plan view of the invention.

FIG. 4 is a left side elevational view of the invention.

FIG. 5 is a right side elevational view of the invention.

FIG. 6 is a top plan view of the invention; and,

FIG. 7 is a bottom plan view of the invention. 

The ornamental design for a motion sensor, as shown and described. 